Device for aiding the hearing.



E. W. SCHNEIDER. DEVICE FOR AIDING THE HEARING.

APPLICATION FILED I'EB.11, 1910.

1,040,429. Patented 001. s, 1912.

EUGENE W. SCHNETDER, OF NEW YORK, N. Y.

DEVICE FOR AIDING THE HEARINGL Specification of Letters Patent.

Patented Oct. 8,1912.

Application filed February 11, 1910. Serial N 0. 543,243.

To all whom it may concern:

Be it known that I, EUGENE W. SCHNEI- DER, a citizen of the United States, residing in the city,'county, and State of New York, have invented certain new and useful Imrovements in Devices for Aiding the caring, of which the following is a full, clear, and exact description.

My invention relates to apparatus for alding the hearing, operating on the telephone- 'ation of the apparatus.

The preferred form of the invention is illustrated in the annexed drawing, in which- Figure 1 is a front view of the transmitter and battery properly connected or assembled, with part of the transmitter casing and diaphragm broken away. Fig. 2 is a rear view of the same, with the transmitter disconnected from the battery. Fig. 3 is a vertical section, showing also the mouth piece or sound collector. Fig. 4 is a detail plan View showing the lock for locking the removable transmitter cover in place. Fig. 5 is a side View of the parts shown in Fig. 4, viewed from the left of such figure. Fig. 6 is a perspective view of the mouth-piece or sound collector.

The battery, designated by 1, is preferably of the dry type, and has a pair of terminals' 2, 3, extending upwardly from its top, one of these terminal plugs being of smaller diameter than the other, as shown.

On the solid metallic back 4 of the trans: mitter 5 are two strips of metal 6, 7, fastened thereto by screws as shown, while between the said strips are two insulated binding devices 8, 9, each consisting of a short bolt with a wide fiat head, held in place by a flat nut on the inner side of the trans-- mitter-back. The device 8 is at the center of the transmitter back and carries at its inner end the carbon electrode or cup 10 containing the usual carbon pellets, notshown, in contact with the diaphragm 11.; The other binding device, 9, is electrically connected by a metal strip 12 to the member 6, which latter is insulated from the back of the transmitter, as shown. Both binding devices are insulated from the transmitter casing, and both carry binding screws 13 for securing the conductors 14 of the receiver (not shown). In order to relieve the conductors of as much strain as possible at the binding screws and prevent raveling of the outer wrapping where the conductors branch, the cord is clamped or bound firmly upon one of the transmitter terminal strips by means of a cleat or clip 15 fastened to the clip by screws, as shown.

With the cap 16, which holds the diaphragm in place, tightly screwed up so as to bring the diaphragm into close contact with the casing, and the inner nuts on the binding devices firmly set up, it will be found that the transmitter is hermetically sealed. Moisture, dust, and other foreign matter are thus effectually excluded. At the same time the connections of the receiver cord are outside, thus permitting the ready renewal of the cord when desired, without the necessity of opening the transmitter and thereby exposing the inner parts to injury or derangement of adjustment.

The projecting ends of the strips 6, 7, are bentinto hollow cylindrical sockets, as shown, at 17,.18,'adapted to slip over the terminal posts 2, 3, as illustrated in Fig. 1. To disengage the parts it is only necessary to given firm pull on the transmitter, as will be readily understood. In order to .insure that in replacing the transmitter the terminals thereof will always be connected to the same battery terminals, one of the latter and the corresponding transmitter terminal are made slightly larger than the others, as shown in Fig. 2.

The circuit from the battery and back of same can now be readily traced. Beginning at the battery terminal 2, the course of the current is through the transmitter terminal 17-6, strip 12, binding device 9, through one of the conductors 14 to the receiver and back through the other to binding device 8. cup 10, diaphragm 11, transmitter-buck 4, transmitter terminal 7--18, and battery terminal 3.

' One of the chief sources of trouble in connection with devices of this character heretofore has been tam ering with the device by the user, in the e ort to examine the interior or to effect a readjustment of' its parts, etc. In order to prevent such tamper ing suitable locking means are provided, as

. for example thedevic'es shown in Figs'.'3'

and, which will now be described.-

Extend ing through an openlng in the {flange-20 of the transmitter back. 4 is a ,sharply pointed finger 21, having an en- "largement or cross-member 22 at its inner :"end. This device rests loosely on the back i adjacent to the c onducting strip 7,

and is held in place by a spring 23 which engagesa stud 24 on said [device and hence serves also to hold the same in engagement with a cam-24 lying over said strip. The cam is carried on a stem 25, screw-threaded in" thetransmitter back directly under the cleat 15; the outer end of the stem being slotted, as shown, to receive a screw driver. Before the instrument-is sent to the user the cam is turned so as to throw the finger 21 out. into the groovebetween two of the threads on the cap 16, and theclea-t' 15 is replaced,

thereby concealing the stem 25. If now the user attempts to unscrew the cap, turning it counter-clockwise as viewed in Fig. 4, the finger 21, biting into the soft metal of the cap, will engage the same firmly and prevent further turning movement in either direction. It is then necessary, in ord'erto" then returned as to' its performance, the fact that the user 'has been attempting to tamper with its ing 'terior parts is at once apparent from'the remove the cap, to remove the cleat 15 and turn the cam or tumbler 24, of which the user is in ignorance. If the instrument is to t e maker with complaint condition of the locking devices. v

The flaring sound collector or mouthpiece 26 is provided at its smaller end with three equidistant hooks 27, and the cover or cap 16 is provided with a similar number of slots 28, so that when the hooks are inserted in the slots and the mouth-piece given a partial turn it will besecurely butremovably attached to the transmitter. The mouth-piece is also provided with three spring arms 29, toengage the transmitter cap and urge the mouthpiece outwardly therefrom,

so that the resulting frictional engagementof the hooks with the inner surface of the cap Wlll effectually prevent accidental .detachment of the mouth-piece or description of the Qopies of this patent may be obtained for five cents callyeliminated. If the cord should become unsightly by'reason of wear, a new cord can be substituted with but slight trouble by removing the clip or cleat 15,.and loosening the binding screws 13. Moreover, thedevice is simple and the construction is such that it may be made strong enough to withstand the careless usage to which devices of the kind are very aptto be subjected. Atthe same pearance. also adds to its convenience, and-the coverlock prevents meddling withand possible irreparable injury to interior parts.

Of course it is to beunderstood that the invention is not limited-to the embodiment bodied in various forms without departure from its proper scope asdefined by the'appended claims.

I claim:

in combination, a telephonic device having a casing provided with a removable cover, and a cover lock inclosed wlthin the casing and attempting to remove the same.

in combination, a telephonic device having a casing provided with a removable cover, a cover lock inclosed within the casing and operated by themovement of the cover in attempting to remove'the same, and means operable from outside the casing for controlling said lock. 3. In an apparatus for aiding the hearing, in combination, a telephonic device having a casing provided with a removable cover, a cover-lock inclosed within the casing; means the lock, and electrical; terminals to connect the telephonic device with a source of current, said terminals carried by the casing and arrangedto conceal said lock controlling means.-

in combination, a telephonic device having a casing provided with a screw-threaded re-- movable cover, a lock inclosed within the engagement with the cover whereby rotary movement of the-cover will cause the said part toggrip of the same, and means operable from outside the casing for controlling theilock.

In testimony whereof I affix my signature EUGENE W. SCHNEIDER. Witnesses:

M. LAWSON DYER, S. S. Dung-1AM.

each, by addressing the Commissioner othetents, Washington, D. 6.?

herein specificallydescribed, but may be em- 1.. In an'apparatus for aiding the hearing,

operated by the movement of the cover in- 2. In an apparatus for aiding the hearing,

in the presence of two subscribing witnesses.

etime the device is of convenient form for carrying in the pocket and is sightly'in ap- The detachable sound collector operable from outside the casing to control 4. In an apparatus for aiding the hearing,

casing and having a part. extending Into the cover and prevent removal 7 

